IS 15658:2021 - Precast Concrete Blocks for Paving

IS 15658: 2021 PRECAST CONCRETE BLOCKS FOR PAVING — SPECIFICATION (Key Information)

RECOMMENDED GRADES OF PAVER BLOCKS FOR DIFFERENT TRAFFIC CATEGORIES

# Grade

Designation

Compressive

Strength at

28 days, fck

MPa

Traffic

Category

Minimum

Thickness

mm

Traffic Examples of Application

1 M-30 30 Non-traffic 50 Building premises, monument premises, landscapes, public

gardens/parks, domestic drives, paths and patios,

embankment slopes, sand stabilization area, etc.

2 M-35 35 Light traffic 60 Pedestrian plazas, shopping complexes ramps, car parks, office

driveways, housing colonies, office complexes, rural roads with

low volume traffic, farmhouses, beach sites, tourist resorts ,

local authority footways, residential roads, etc.

3 M-40 40 Medium

traffic

80 City streets, small and medium market roads, low volume

roads, utility cuts on arterial roads, etc.

4 M-50 50 Heavy

traffic

100 Bus terminals, industrial complexes, mandi houses, roads on

expansive soils, factory floor, service stations, industrial

pavements, etc.

5 M-55 55 Very Heavy

Traffic

100 Container terminals, ports, docks yards, mine access roads,

bulk cargo handling areas, airport pavements, etc.

RECOMMENDED DIMENSIONS & TOLERANCES FOR PAVER BLOCKS

# Dimension Recommended Values Tolerance Limit for Paver Block

Thickness < 100 mm Thickness ≥ 100 mm

1 Width - +/- 2 mm +/- 3 mm

2 Length - +/- 2 mm +/- 3 mm

3 Thickness 50-120 mm +/- 3 mm +/- 4 mm

4 Aspect Ratio Max. 4.0

5 Chamfer Min. 5mm, Max. 7mm +/- 1 mm +/- 1mm

6 Squareness Nil +/- 2 mm +/- 3 mm

PHYSICAL REQUIREMENTS:

# Characteristic Individual Average

1 Water Absorption, %, Max 7 6

2 Compressive Strength, MPa, Min

(Value of fck is given in col 3 of Table 1 above)

fck – 3 fck + 0.825 x established standard deviation

(rounded off to nearest 0.5 MPa)

3 Abrasion Resistance, mm3 / 5000 mm2, Max

a) Dry

b) Wet

20,000

22,000

18,000

20,000

4 Tensile Splitting Strength, MPa, Min

• For grades < M 40

• For grades ≥ M 40

0.08 fck

3.0 MPa

0.085 fck

3.6 MPa

5 Flexural Strength, MPa, Min 0.10 fck 0.11 fck

(For further details please refer to the Standard)